Circulatory System

∞ generated and posted on 2016.03.20 ∞

Means by which nutrients, oxygen, and wastes are transported to and from body tissues.

The Circulatory System involves the movement of fluid throughout the body, which for us results from (i) the pushing of blood through arteries due the action of the heart, (ii) the movement of materials into and out of the blood (from and to body tissues at the very smallest of blood vessels called capillaries), and (iii) the return to the heart within veins of blood that has moved through capillaries. Also is the creation within body tissues of lymph and its subsequent movement through lymphatic vessels back to the blood.

The above video provides a very quick introduction to the circulatory system.

The above video considers circulatory systems as seen in a diversity of animals; a fair amount of the emphasis is on the heart but it does present the true distinction between what is an artery and what is a vein. A focus on blood and blood vessels themselves begins at 5:58 and then emphasis returns to consideration of the heart again at 8:17.

The above video provides a broader perspective on what circulation is all about rather than focusing on the human circulatory system but nonetheless is an excellent introduction to the basics.

The above video discusses blood disorders including those associated with red blood cells, white blood cells, platelets, and plasma.